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一、原理和方法未被污染的天然油的小滴放于矿物表面上,在矿物表面存在水和油的情况下,在油-水-固三相接触点处,通过水相测量矿物表面和油-水界面之间的平衡角,即接触角(图1)。利用接触角,可以评价油层的润湿性,其评价标准见表1。根据不同的油层矿物组成,在实验中可以使用不同的矿物的磨光矿片,油层是砂岩时,可使用磨光石英矿片;油层是灰岩时,可使用磨光方解石矿片。接触角用液-液-固型接触角计测定,实验是在一个特制的聚四氟乙烯矩型小室内进行
First, the principle and method Uncontaminated natural oil droplets placed on the mineral surface, the presence of water and oil on the mineral surface case, the oil - water - solid three-phase contact point through the water phase to measure the mineral surface and The equilibrium angle between the oil-water interface, the contact angle (Figure 1). The use of contact angle, can evaluate the wettability of the reservoir, the evaluation criteria in Table 1. Depending on the mineral composition of the reservoirs, different types of mineralized mineral deposits can be used in the experiment. When the reservoir is sandstone, polished quartz can be used. When the reservoir is limestone, polished calcite can be used. The contact angle was measured using a liquid-liquid-solid contact angle meter. The experiment was performed in a specially made Teflon rectangular cell